Updates to eureka v1.9.21
Updates to eureka v1.9.21

fixes gh-3787

ryanjbaxter/spring-cloud-netflix,spring-cloud/spring-cloud-netflix,ryanjbaxter/spring-cloud-netflix,ryanjbaxter/spring-cloud-netflix,spring-cloud/spring-cloud-netflix,ryanjbaxter/spring-cloud-netflix,ryanjbaxter/spring-cloud-netflix